Handling radio link failure in a radio communications network

摘要

Embodiments herein relate to a method in a radio base station for enabling a user equipment to establish a connection in a radio communications network The user equipment is served in a first cell controlled by the radio base station. The radio base station is comprised in the radio communications network. The radio base station detects a failure of a radio link between the user equipment and the radio base station. The radio base station then forwards a user equipment context of the user equipment to a circuitry controlling a second cell when the failure is detected. The user equipment context enables the circuitry controlling the second cell to serve the user equipment and thereby enables the user equipment to establish the connection in the radio communications network.

主权项

1. A method in a radio base station for enabling a user equipment to establish a connection in a radio communications network, the user equipment served in a first cell controlled by the radio base station, the radio base station being in the radio communications network, and wherein the method comprises:
detecting a failure of a radio link between the user equipment and the radio base station, wherein said detecting comprises:
tracking a channel quality of the radio link;determining at least one of whether the tracked channel quality exceeds an upper threshold value and whether the tracked channel quality is below a lower threshold value;monitoring a traffic activity over the radio link when at least one of the tracked channel quality exceeds the upper threshold value and the tracked channel quality is below the lower threshold value; anddetermining that the failure of the radio link is detected when traffic activity falls below an activity threshold, and there is data buffered or protocol activity for the user equipment in the radio base station; and forwarding a user equipment context of the user equipment to a circuitry controlling a second cell when the failure is detected, said user equipment context enabling the circuitry controlling the second cell to serve the user equipment and thereby enabling the user equipment to establish the connection in the radio communications network.